Current sensing resistor

Abstract

The utility model relates to the technical field of resistors, in particular to a current sensing resistor. According to the resistor disclosed by the utility model, current detection is carried out through the current detection point positions on the two pole pieces, voltage detection is carried out through the voltage detection point positions on the four test pole pieces, and the insulation plates are arranged between the pole pieces and the test electrodes to block current circulation, so that the current flowing into the voltage detection point positions is reduced, and the test efficiency is improved. Further, the influence of heating of the voltage detection point on the measurement result is reduced, the influence of temperature drift of the voltage detection point on the whole product is reduced, the measurement result is more stable and accurate, and the performance is particularly remarkable under the condition of high temperature or large current; and meanwhile, the resistor keeps a more stable resistance value in a long-term use process, so that the long-term reliability and the service life of the product are improved.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, and specifically to a current sensing resistor. Background Technology

[0002] Currently, many resistor products on the market still use copper as the electrode material. While these traditional designs meet market demands to some extent, their structure and material selection have significant drawbacks, primarily including: 1. The electrodes exhibit a significant temperature drift effect when the temperature changes. This effect affects the overall temperature drift value of the resistor, leading to unstable measurement results, especially under high temperature or high current conditions. 2. Due to the temperature drift effect of the electrodes, even a small drop in voltage between the voltage contacts at the connection point can negatively impact the overall measurement accuracy, increasing measurement errors. 3. The temperature drift effect not only affects short-term measurement accuracy but also the long-term stability of the resistor. During prolonged use, temperature changes cause resistance value drift, reducing the resistor's reliability. Utility Model Content

[0003] The technical problem to be solved by this invention is to provide a current sensing resistor that can reduce the current flowing into the voltage detection point and ensure more stable and accurate measurement results.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A current sensing resistor, comprising:

[0006] The resistor has welding surfaces on both sides;

[0007] The electrode component includes two electrodes, the welding ends of which are respectively welded to the welding surface of the resistive body. A current detection point is provided in the middle of the electrodes for current detection.

[0008] A test component is disposed on the electrode plate. The test component includes two test electrodes. Two test slots are provided on the welding end of the electrode plate. The test slots are arranged one-to-one with the test electrodes. The connection end of the test electrode is connected to the resistive element, and its free end is connected to the electrode plate. Voltage detection points are provided on the test electrodes for voltage detection.

[0009] A test gap is provided between the electrode and the test electrode, and an insulating plate is provided on the test gap.

[0010] In one embodiment of this utility model, the sum of the lengths of the welding end of the electrode and the connection end of the two test electrodes is greater than or equal to the length of the welding surface of the resistive element.

[0011] In one embodiment of this utility model, the resistive element is made of a resistive material, and positioning grooves are provided on both sides of the resistive element. The positioning grooves have a trapezoidal structure, and the length of the connection end of the test electrode is greater than the depth of the positioning groove.

[0012] In one embodiment of this utility model, the inner sidewall of the test groove is an arc-shaped sidewall, and the test electrode is provided with an arc-shaped surface that matches the test groove. One end of the arc-shaped surface is connected to the arc-shaped sidewall, so that a crescent-shaped test gap is formed between the arc-shaped sidewall and the arc-shaped surface. The test electrode is provided with a straight surface that matches the side surface of the electrode sheet.

[0013] In one embodiment of this utility model, guide grooves are provided on the arc-shaped sidewall and the arc-shaped surface, the shape of the insulating plate matches the shape of the test gap, an arc-shaped guide plate is provided on the insulating plate, and the two sides of the arc-shaped guide plate are engaged on the two guide grooves.

[0014] In one embodiment of the present invention, a fixing groove is provided on the edge of the guide groove, and a fixing plate is provided on each side of the arc-shaped guide plate, and the fixing plate is engaged with the fixing groove.

[0015] In one embodiment of this utility model, the insulating plate and the arc-shaped guide plate are integrally formed structures, and both the insulating plate and the arc-shaped guide plate are made of ceramic, silicon nitride, rubber or stone.

[0016] In one embodiment of the present invention, the current detection point includes a detection groove, a detection hole is provided on the detection groove, and an annular groove is provided on the edge of the detection hole, so that the detection hole has a stepped hole structure.

[0017] In one embodiment of this utility model, the voltage detection point is provided with a test hole, and a mounting cylinder is inserted through the test hole. The top end of the mounting cylinder extends out of the test hole to form a boss, and an electroplating layer is provided on the mounting cylinder and the test hole.

[0018] In one embodiment of this utility model, a test rivet is provided through the mounting cylinder, and a conical head is provided at the free end of the test rivet. The height of the conical head is less than or equal to the depth of the test hole.

[0019] The beneficial effects of this utility model are:

[0020] This resistor uses current detection points on two electrodes for current detection and four voltage detection points on four test electrodes for voltage detection. An insulating plate is placed between the electrodes and the test electrodes to block current flow, thereby reducing current inflow at the voltage detection points. This reduces the impact of heat generated at the voltage detection points on the measurement results and the temperature drift at the voltage detection points on the overall product, ensuring more stable and accurate measurement results, especially under high temperature or high current conditions. Furthermore, this resistor maintains a more stable resistance value during long-term use, improving the long-term reliability and service life of the product. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a current sensing resistor according to the present invention.

[0022] Figure 2 This is a schematic diagram of the test gap of this utility model.

[0023] The following are the labels in the diagram: 1. Resistor; 11. Positioning groove; 2. Electrode; 21. Current detection point; 22. Detection groove; 23. Detection hole; 24. Annular groove; 3. Test electrode; 31. Voltage detection point; 32. Test gap; 33. Insulating plate; 331. Arc-shaped guide plate; 332. Guide groove; 333. Fixing plate; 334. Fixing groove; 34. Arc-shaped sidewall; 35. Arc-shaped surface; 4. Test hole; 41. Mounting cylinder; 42. Test rivet. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0025] Reference Figure 1-2 As shown, a current sensing resistor includes:

[0026] Resistor 1 has welding surfaces on both sides;

[0027] The electrode component includes two electrodes 2, the welding ends of which are respectively welded to the welding surface of the resistor 1. A current detection point 21 is provided in the middle of the electrodes 2, and the current detection point 21 is used for current detection.

[0028] A test component is disposed on the electrode 2. The test component includes two test electrodes 3. Two test slots are provided on the welding end of the electrode 2. The test slots are arranged one-to-one with the test electrodes 3. The connection end of the test electrode 3 is connected to the resistor 1, and its free end is connected to the electrode 2. A voltage detection point 31 is provided on the test electrode 3. The voltage detection point 31 is used for voltage detection.

[0029] A test gap 32 is provided between the electrode 2 and the test electrode 3, and an insulating plate 33 is provided on the test gap 32.

[0030] The resistor of this invention detects current through current detection points 21 on two electrodes 2 and voltage through voltage detection points 31 on four test electrodes 2. An insulating plate 33 is placed between the electrodes 2 and the test electrodes 3 to block the flow of current, thereby reducing the current flowing into the voltage detection points 31. This reduces the impact of heat generated at the voltage detection points 31 on the measurement results and the temperature drift of the voltage detection points 31 on the overall product, ensuring more stable and accurate measurement results, especially under high temperature or high current conditions. At the same time, the resistor maintains a more stable resistance value during long-term use, improving the long-term reliability and service life of the product.

[0031] This invention uses electrode materials with low temperature coefficients, which significantly reduces the temperature drift effect and improves the overall temperature drift stability of the resistor. By reducing the heat generated by voltage contact, it reduces the impact of temperature drift on the measurement results, thereby improving the stability and measurement accuracy of the entire product. The optimized structural design reduces voltage drop, thereby reducing measurement error and improving the measurement accuracy and reliability of the resistor.

[0032] In one embodiment of this utility model, the sum of the lengths of the welding end of the electrode 2 and the connection ends of the two test electrodes 3 is greater than or equal to the length of the welding surface of the resistor 1, so that the electrode 2, the two test electrodes 3 and the resistor 1 form a stable connection, reducing the processing difficulty, ensuring the connection consistency with the resistor 1 and the electrode 2, and improving the performance.

[0033] In one embodiment of this utility model, the resistor 1 is made of a resistive material, and positioning grooves 11 are provided on both sides of the resistor 1. The positioning grooves 11 have a trapezoidal structure, and the length of the connection end of the test electrode 3 is greater than the depth of the positioning grooves 11.

[0034] Specifically, the length of the connection end of the test electrode 3 is greater than the depth of the positioning groove 11, which reduces the connection surface between the resistor 1 and the test electrode 3, reduces current flow, reduces the heat generated by voltage contact, thereby significantly reducing the temperature drift effect, improving the long-term stability and reliability of the resistor, and extending the service life of the product.

[0035] In one embodiment of this utility model, the inner sidewall of the test groove is an arc-shaped sidewall 34, and the test electrode 3 is provided with an arc-shaped surface 35 that matches the test groove. One end of the arc-shaped surface 35 is connected to the arc-shaped sidewall 34, so that a crescent-shaped test gap 32 is formed between the arc-shaped sidewall 34 and the arc-shaped surface 35. The test electrode 3 is provided with a straight surface that matches the side surface of the electrode 2.

[0036] Specifically, a crescent-shaped test gap 32 is formed between the arc-shaped sidewall 34 and the arc-shaped surface 35, effectively blocking current flow and reducing heat generated by voltage contact, thereby significantly reducing the temperature drift effect. This reduction in temperature drift greatly improves the measurement accuracy of the resistor under different temperature conditions, ensuring more stable and accurate measurement results, especially under high temperature or high current conditions. At the same time, one end of the arc-shaped surface 35 is connected to the arc-shaped sidewall 34, allowing the complete electrode 2 to be directly integrally formed by punching, reducing processing costs. The test electrode 3 is provided with a straight surface that matches the side of the electrode 2, which can ensure the consistency of connection with the resistor body 1 and the electrode 2, improving performance.

[0037] In one embodiment of this utility model, guide grooves 332 are provided on the arc-shaped sidewall 34 and the arc-shaped surface 35, the shape of the insulating plate 33 matches the shape of the test gap 32, and an arc-shaped guide plate 331 is provided on the insulating plate 33, with the two sides of the arc-shaped guide plate 331 being engaged on the two guide grooves 332.

[0038] Specifically, the insulating plate 33 is provided with an arc-shaped guide plate 331. The two sides of the arc-shaped guide plate 331 are engaged with two guide grooves 332, which can easily clamp the insulating plate 33 along the two guide grooves 332 onto the test gap 32, reducing the installation difficulty and improving the performance.

[0039] In one embodiment of the present invention, a fixing groove 334 is provided on the edge of the guide groove 332. The fixing groove 334 is only a groove, which forms a convex point and groove cooperation with the fixing plate 333, and does not penetrate the entire guide groove 332. A fixing plate 333 is provided on each side of the arc-shaped guide plate 331, and the fixing plate 333 is engaged on the fixing groove 334.

[0040] Specifically, the fixing plate 333 is mounted on the fixing groove 334, so that it can support the electrode 2 and the test electrode 3, prevent the electrode 2 and the test electrode 3 from getting close and forming a short circuit, further effectively blocking the current flow and reducing the heat generated by voltage shock.

[0041] In one embodiment of this utility model, the insulating plate 33 and the arc-shaped guide plate 331 are integrally formed structures, and both the insulating plate 33 and the arc-shaped guide plate 331 are made of ceramic, silicon nitride, rubber or stone.

[0042] Preferably, both the insulating plate 33 and the arc-shaped conductor plate 331 are made of ceramic material. Ceramic material has excellent high temperature resistance, which enables the resistor to work stably in higher temperature environments, reduces the failure and maintenance needs caused by high temperature, simplifies the operation and maintenance process, and improves the ease of use of the product.

[0043] In one embodiment of the present invention, the current detection point 21 includes a detection groove 22, a detection hole 23 is provided on the detection groove 22, and an annular groove 24 is provided on the edge of the detection hole 23, so that the detection hole 23 has a stepped hole structure.

[0044] Specifically, the current detection point 21 on the electrode 2 is connected to the resistance performance connection device. The detection hole 23, which has a stepped hole structure, can facilitate the connection of the resistor circuit and fix the resistor element. At the same time, the detection hole 23, which has a stepped hole structure, can also position the resistor element and ensure the positional accuracy of the resistance detection.

[0045] In one embodiment of this utility model, the voltage detection point 31 is provided with a test hole 4, and a mounting cylinder 41 is inserted through the test hole 4. The top end of the mounting cylinder 41 extends out of the test hole 4 to form a boss, and an electroplating layer is provided on the mounting cylinder 41 and the test hole 4.

[0046] Specifically, the top of the mounting cylinder 41 extends out of the test hole 4 to form a boss, which facilitates the connection of probes and other connecting components to the test hole 4, improving the ease of use of the product and increasing the efficiency of measurement and operation.

[0047] In one embodiment of this utility model, a test rivet 42 is provided on the mounting cylinder 41, and a conical head is provided at the free end of the test rivet 42. The height of the conical head is less than or equal to the depth of the test hole 4.

[0048] Specifically, a test rivet 42 is provided on the mounting cylinder 41. The free end of the test rivet 42 is provided with a tapered head. The tapered head on the test rivet 42 can facilitate the quick connection of the resistance performance connection device, improve the testing efficiency, and reduce the difficulty of operation. The height of the tapered head is less than or equal to the depth of the test hole 4 to avoid protrusions, which can facilitate the stacking of resistors and also prevent resistors from scratching each other.

[0049] Users can use resistors over a wider temperature range without frequent calibration and adjustment, increasing ease of operation and efficiency. Resistors can operate stably in higher temperature environments, reducing failures and maintenance needs caused by high temperatures, simplifying operation and maintenance processes, and improving the ease of use of the product.

[0050] In use, according to the four-wire method principle, the current detection point 21 on electrode 2 is connected to the resistance performance connection device. The detection hole 23, which has a stepped hole structure, can facilitate the connection of the resistor circuit and fix the resistor element. The voltage detection point 31 on the test electrode 3 is connected to the voltage contact. The voltage detection point 31 is used to measure the voltage drop across the resistor element in the two voltage measurement channels. During the test, the current flow to the test electrode 2 is blocked by the insulating plate 33, thereby reducing the current inflow into the voltage detection point 31. This reduces the impact of the heat generated by the voltage detection point 31 on the measurement results and reduces the impact of the temperature drift of the voltage detection point 31 on the entire product, thereby improving the stability and measurement accuracy of the entire product.

[0051] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A current sensing resistor, characterized in that, include: The resistor has welding surfaces on both sides; The electrode component includes two electrodes, the welding ends of which are respectively welded to the welding surface of the resistive body. A current detection point is provided in the middle of the electrodes for current detection. A test component is disposed on the electrode plate. The test component includes two test electrodes. Two test slots are provided on the welding end of the electrode plate. The test slots are arranged one-to-one with the test electrodes. The connection end of the test electrode is connected to the resistive element, and its free end is connected to the electrode plate. Voltage detection points are provided on the test electrodes for voltage detection. A test gap is provided between the electrode and the test electrode, and an insulating plate is provided on the test gap.

2. The current sensing resistor as described in claim 1, characterized in that, The sum of the lengths of the welding end of the electrode and the connection end of the two test electrodes is greater than or equal to the length of the welding surface of the resistive element.

3. The current sensing resistor as described in claim 1, characterized in that, The resistor is made of a resistive material, and positioning grooves are provided on both sides of the resistor. The positioning grooves are trapezoidal in shape, and the length of the connection end of the test electrode is greater than the depth of the positioning groove.

4. The current sensing resistor as described in claim 1, characterized in that, The inner wall of the test groove is an arc-shaped sidewall. The test electrode is provided with an arc-shaped surface that matches the test groove. One end of the arc-shaped surface is connected to the arc-shaped sidewall, so that a crescent-shaped test gap is formed between the arc-shaped sidewall and the arc-shaped surface. The test electrode is provided with a straight surface that matches the side of the electrode sheet.

5. The current sensing resistor as described in claim 4, characterized in that, The arc-shaped sidewall and the arc-shaped surface are provided with guide grooves. The shape of the insulating plate matches the test gap. An arc-shaped guide plate is provided on the insulating plate. The two sides of the arc-shaped guide plate are engaged with the two guide grooves.

6. The current sensing resistor as described in claim 5, characterized in that, The guide groove has a fixing groove on its edge, and a fixing plate is provided on each side of the arc-shaped guide plate. The fixing plate is engaged with the fixing groove.

7. The current sensing resistor as described in claim 5, characterized in that, The insulating plate and the arc-shaped guide plate are integrally formed structures, and both the insulating plate and the arc-shaped guide plate are made of ceramic, silicon nitride, rubber or stone.

8. The current sensing resistor as claimed in claim 1, characterized in that, The current detection point includes a detection groove, and a detection hole is provided on the detection groove. An annular groove is provided on the edge of the detection hole, so that the detection hole has a stepped hole structure.

9. The current sensing resistor as claimed in claim 1, characterized in that, The voltage detection point is provided with a test hole, and a mounting cylinder is inserted through the test hole. The top end of the mounting cylinder extends out of the test hole to form a boss. The mounting cylinder and the test hole are provided with an electroplated layer.

10. The current sensing resistor as claimed in claim 9, characterized in that, A test rivet is installed on the mounting cylinder, and a conical head is provided at the free end of the test rivet. The height of the conical head is less than or equal to the depth of the test hole.

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